That makes sense to me, that the Holy Spirit would only usethe true Gospel to affect the transforamtion od sinners into saints. And Godhelp those who atr trusting in any sacrament, church label, good works etc to bethe means by which they claim to be christian now!

AND..... in our day it is particularly popular for one to believe in one's own "faith" (free-will decision to accept Jesus), which makes the salvation formula to be: grace+faith=justification.